/**
 * Copyright (C) 2008-2012 Matt Gumbley, DevZendo.org <http://devzendo.org>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.devzendo.shell.pipe

import org.devzendo.shell.interpreter.Variable

class VariableInputPipe(variable: Variable) extends VariablePipe(variable) with InputPipe {
    private var index = 0

    def setTerminated() {
        this.synchronized {
            index = variable.size()
        }
    }

    def next(): Option[AnyRef] = {
        this.synchronized {
            if (index < variable.size()) {
                val prevIndex = index
                index += 1
                Some(variable.get(prevIndex))
            } else {
                None
            }
        }
    }
}
